but few files were missing while installing and at the final installation it had given lot of errors like missing files on

D rive etc , n not I get error while using usn password

ora-12560 tns protocol adapter error , please advise .

So if "few files were missing while installing and at the final installation it had given lot of errors" why would you continue and expect things to work?

99.999999 % of complaints about 'files missing' during installation are due to not reading the instructions with the download. Specifically, the part about unzipping both downloaded zip files into the *same* directory. Unfortunately, this is NOT the default behavior in Windows.